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How We Collect our Readership Statistics

To find out more about how we display these statistics online, read our

You might have noticed that we provide readership data for each of our books online, including the number of times each book has been viewed and the location of the readers. If you would like to know more about how this data is collected and where it comes from, read on!

Our readership data is composed of different measures obtained from different platforms:

Platform

Measure

Geographic
information

Update Frequency

OBP HTML
Reader

Book
Sessions

Yes

Daily

OBP PDF
Reader

Book
Sessions

Yes

Daily

OBP
Downloads

Book
Downloads

No

Weekly

Google
Books

Book
Sessions

No

Monthly

Open
Edition

Book Visits

No

Monthly

Unglue.it

Book
Downloads

No

Quarterly

Classics
Library

Book
Sessions

Yes

Weekly

Internet
Archive

Book Visits

No

Quarterly

OBP PDF
Downloads

Book
Downloads

No

Weekly

Google Play
Books

Book Downloads

No

Monthly

Kindle

Book
Downloads

No

Quarterly

World
Reader App

Book Visits

No

Quarterly

World
Reader Web

Book Visits

No

Quarterly

OAPEN

Book Downloads

No

Yearly

A Book Session is a group of visits made by the same user within a continuous time frame. To record these sessions we use Google Analytics, and a session lasts until there are 30 minutes of inactivity; if a single user keeps interacting with the website within this time frame, multiple visits to the same book will be counted as one session. For more information on Google Analytics’ definition of a session read: How a web session is defined in Analytics.

It is important to note that we use Google Analytics’ measure for a Book Session rather than an alternative such as COUNTER, because Google Analytics has a stricter measure for the length of a Book Session. COUNTER has a much shorter time frame for a single Session, and therefore records more Sessions than Google Analytics. We do collect data for our books that would meet COUNTER's measures, but we don’t record it publicly. For more information about COUNTER see: https://www.projectcounter.org/

Book Visits represent the total number of times a book has been accessed. This can include multiple visits by the same IP address, which are counted as separate visits.

Book Downloads represent the total number of times a book has been downloaded. In addition to the download data we receive from Unglue.it, we collect free ebook download data from other platforms including our own website, Kindle, Google Play, etc, and we add these into the statistics we report. However, these download figures are calculated slightly differently on each platform, depending on whether repeat downloads to the same IP address in quick succession are counted as two downloads or one. As with Book Sessions, we err on the side of the lower figure wherever possible.

Geographic information: most platforms do not provide geographic information about the users accessing their content, and some people configure their browsers to block any third party tracking scripts attempting to collect such information (e.g., Google Analytics). For these reasons we are only able to provide readership data by country for a small percentage of our total figures - about 40%.

We try to provide as complete a picture as possible about the number of times our books have been freely accessed, as well as the location of the readers, because this information helps to demonstrate the value of Open Access publishing. For more about what we can learn from our readership data, see our blog post.